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ixgbe: use rx_buffer_info->dma instead of nr_frags to determine skb unmap 

This patch changes the driver so that it uses rx_buffer_info->dma to
determine if it needs to unmap the page instead of sh_info->nr_frags.  This
helps to prevent a cache line miss when receiving small packets as the
rx_buffer_info data should already be in the cache.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2009-06-04 15:59:49 +00:00 committed by David S. Miller
parent 74766013a1
commit 21fa4e66bd
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ixgbe/ixgbe_main.c
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@ -708,7 +708,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
prefetch(skb->data - NET_IP_ALIGN);
rx_buffer_info->skb = NULL;
if (len && !skb_shinfo(skb)->nr_frags) {
if (rx_buffer_info->dma) {
pci_unmap_single(pdev, rx_buffer_info->dma,
rx_ring->rx_buf_len,
PCI_DMA_FROMDEVICE);